UCL,LCL按照±3标准差标准差和Xbar±A2R计算结果不同
本人现在在自学SPC，但是老是发现在Xbar-R图中，UCL，LCL按照Average±3标准差（sigma）和按照Xbar±A2R计算结果不同，其中sigma是按早Xbar计算的的，而不是所有的X值，请问到底是什么原因，是否可能是因为我每组的抽样数比较大（我每组抽样数为10）导致的误差，请大哥大姐帮下忙,谢谢了！
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乌溪 (威望:0) (浙江 绍兴) 电子制造 工程师
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我重新计算了UCL，LCL按照Xbar±A2R计算没错，可能是我SIGMA计算有问题，我发数据上来你帮忙计算下sigma，把计算过程也给我，我怕可能是我计算过程有问题，我是用excel里的STDEVA计算的
10.8 9.9 10.0 11.0 11.4 10.8 11.8 11.4 10.8 10.4
10.2 9.7 8.7 10.6 10.2 11.9 10.9 11.4 12.3 12.0
12.3 13.0 10.8 10.7 9.8 10.6 9.7 11.1 10.0 10.4
9.8 8.9 11.1 11.3 9.5 10.5 10.5 10.4 10.4 9.8
10.3 9.6 9.9 8.4 11.8 9.7 10.6 10.8 9.0 10.2
6.7 9.6 8.2 11.8 11.6 9.6 10.6 11.1 11.3 10.3
10.5 8.1 10.6 11.5 9.8 9.9 10.0 12.0 10.2 10.3
10.6 9.4 9.5 10.4 8.4 10.9 9.8 11.2 8.8 10.2
11.2 9.4 8.2 10.2 11.2 9.3 11.8 10.2 8.3 8.3
11.3 10.6 8.1 11.7 10.2 9.7 11.0 12.2 11.3 10.1
10.1 9.9 11.3 9.4 10.0 9.3 9.3 12.4 8.9 8.2
9.8 9.4 10.1 10.0 10.5 10.0 9.7 10.9 10.8 10.1
11.9 8.6 8.8 11.6 9.5 8.7 9.6 11.9 9.3 10.2
10.7 10.7 10.1 9.9 9.8 6.7 8.6 8.3 9.2 9.6
11.8 10.9 9.9 9.2 10.5 10.6 10.1 11.3 10.1 12.1
11.3 8.9 10.9 10.1 12.2 9.1 10.2 11.1 9.8 9.7
9.9 9.4 9.3 9.7 9.0 11.2 7.4 9.3 10.5 9.1
8.8 12.0 11.0 9.2 8.6 12.6 11.0 9.2 10.4 12.0
8.7 8.6 8.7 10.7 8.0 8.5 9.9 9.3 8.7 12.1
11.1 10.5 11.1 11.7 7.4 10.5 6.3 6.7 10.9 10.9
9.3 10.5 9.7 9.7 9.3 11.1 9.5 9.7 9.2 11.3
8.8 8.7 10.0 6.8 10.6 10.4 10.7 9.8 7.9 9.1
9.6 9.8 9.8 7.6 11.5 8.6 9.8 10.1 9.6 9.7
8.7 9.7 10.6 8.7 10.4 9.8 9.6 10.1 10.8 8.9
8.4 9.3 11.0 11.1 10.2 8.1 9.3 9.8 10.6 9.8
8.7 9.9 10.5 11.2 9.8 10.1 10.3 11.5 9.7 9.9
9.8 9.8 9.3 8.4 9.3 8.2 8.9 10.6 10.2 8.9
11.5 8.9 8.7 11.2 10.9 5.8 7.3 10.1 9.4 6.3
8.8 11.8 10.3 10.7 10.7 11.0 10.5 10.6 10.1 11.9
10.9 9.2 10.6 10.5 11.5 9.6 9.5 10.8 11.8 10.7
8.8 9.4 8.7 9.0 9.4 9.2 10.4 10.2 10.1 10.1
8.4 9.2 9.7 6.5 7.7 10.5 9.3 10.5 10.2 9.1
10.5 9.4 10.1 10.8 10.1 11.5 10.1 11.1 10.0 10.5
8.6 11.1 8.4 10.6 12.2 10.4 9.1 11.5 11.0 8.9
10.8 9.2 9.2 10.0 8.2 9.5 8.2 9.6 10.9 10.1
6.6 10.0 9.7 10.8 11.3 9.4 9.3 10.9 11.2 10.7
12.5 10.4 9.5 11.0 11.2 9.8 9.7 10.8 10.1 9.9
12.8 8.9 8.1 11.0 11.4 8.5 9.1 10.3 10.3 9.2
10.7 10.0 11.1 9.0 9.8 10.0 9.5 10.3 8.9 8.4
8.9 7.6 9.1 9.4 10.4 9.8 8.7 9.6 10.3 6.3
10.7 8.2 9.3 11.1 10.4 8.2 9.3 9.4 10.6 8.8
10.7 10.1 9.2 9.9 10.7 8.7 9.3 10.4 8.2 9.8
9.5 8.1 7.0 9.6 9.2 10.7 8.2 9.5 9.8 8.7
9.5 10.3 10.6 8.4 9.1 9.4 9.2 8.1 9.4 10.1
9.5 8.5 10.7 10.4 7.8 10.6 11.0 9.6 10.0 6.5
9.5 10.5 12.1 9.2 9.8 12.3 11.6 10.1 9.7 11.7
10.0 9.9 9.5 10.6 9.7 10.3 10.3 9.1 9.1 10.8
10.5 10.6 10.4 9.4 9.2 10.3 10.5 8.8 12.2 11.2
11.5 9.6 9.1 10.3 11.3 10.1 10.3 11.8 11.0 9.3
11.2 9.4 9.3 9.8 11.7 9.7 9.2 9.5 10.4 10.1
9.5 9.3 10.0 10.3 9.7 9.8 10.6 9.1 9.4 11.3
9.8 11.0 10.4 10.0 11.6 10.8 9.1 9.1 10.7 10.6
11.0 9.7 10.6 10.9 12.5 9.2 9.6 10.7 11.3 10.6
11.2 11.2 10.7 9.5 9.3 10.6 10.2 8.5 8.4 11.2
9.6 9.0 7.7 5.9 9.1 9.6 8.9 8.4 6.7 9.4